Underreamer



J. oL'soN UNDERREAMER 7 Feb; 22, 1927.

Fiied March.30, 192s 2 Sheets-Sheet 1 1,618,294 Fe 22 1 J. OLSONuunsansmnn Filed March 50. 1926 Y Z Sheets-Sheet 2 Patented Feb. 22,1927.

UNITED STATES PATENT OFFICE.

JOSEPH Orson, or HOUSTON, Texas.

' UNDERREAMER.

4 Application filed March 30,1926. Serial No. 98,489.

smooth bottom forthe lower endof a bore in the earth for the purposestated.

A further feature of the invention is to provide an implement ofthecharacter described which will. work in soft formation and which isalso. equipped with means which adapt it for use in certain kinds ofhard formation. I

A still further feature of the invention is to provide an implement ofthe character described which may be cheapl and easily constructed andeasily operate and which is very effective in use. I v

With the above and other Objects in view this invention has particularrelation to certain novel features of construction, operation andarrangement-pf parts, an example of which is given 'in thisspecifieationand illustrated in the accompanying drawings, wherein Figure 1 shows avertical sectional view of the implement partly in section.

Figure 2 shows a cross-sectional view, taken on the line 22 of Figure 1.

Figure 3 shows a vertical sectional view of the barrel, taken on theline 33 of Figure 2, and

Figure 4 shows a vertical sectional view,

showing an outline "of the bore formed and the footing therein.

Referring now more particularly to the drawings, wherein like numeralsof reference desi nate similar parts in each of the figures, t e numeral1' designates a driving shaft, attached to the lower end of which is thebarrel 2. This barrel is cup-shaped in form and has a flat bottom. Theshaft 1 is extended beneath the barrel and formed with a guide point 3.Fitted over, and slidable on the shaft 1, there is a sleeve 4: whichcarries a key 5 which works in the lengthwise key way,6, in the shaft,to prevent the sleeve from turning on the shaft, but to permit a limitedlengthwise movement of the sleeve on the shaft.

The upper end of the sleeve has the fixed handles 7, 7 by means of whichthe 'implement may be turned.

Pivoted at their inner ends to the bottom of the barrel, on oppositesides of the shaft 1, are the scoop-like cutters 8, 8, and the "alignedportions 9, 9, of the upstanding rim of the barrel 2 are cut away,forming openings through which said cutters may work, Links 10, 10, arepivoted, at their upper ends, to the sleeve 4, and at their lower ends,

to the respective cutters 8.

The bottom, of the barrel 2 has the radial blades 11, 11, and in frontof them theradial slits 12, 12, for a purpose hereinafter to"? bedescribed.

The upper end of the shaft 1 may be- In use the hole, as 15, to beunderreamed,

or enlarged, is first formed by the use of any ordinary implementprovlded for the purpose. The nut 13 is then either removed, or run upto theuppe'r end of the shaft 1. The implement herein described is. thenpicked up by the handles 7 and the sleeve will move upwardly on theshaft as far as permitted by the key 5 and this will carry the. cutters8 into upright position, parallel with said shaft.

The implement is then lowered into the bore until it rests on the bottomand the weight of the sleeve will force the outer, or free ends of thecutters 8 out against the walls of the bore. The implement is thenturned by the handles 7 and a downward pressure, at the same timeexerted against them and this will gradually force the cutters out into,and-they willcut away the walls at the bottom of the bore. i

It is to be noted that the outer ends of these cutters, at the rear,have the upstand ing arcuate guides 16, 16, which engage the loose earthcut away, and force it throu h the openings 9, 9, into the barrel. Whllethis work is in pro ress the blades 11 will cut away the material at thebottom of the bore which will pass up throu h the slots 12 intothebarrel. As the barre is filled from time to time the implement may belifted out of the excavation and the barrel em tied.

If very hard strata be encountere the nut 13 may be threaded onto theupper end of the shaft 1 and run down against the upper end of thesleeve 4; and from time to time during the progress of the work may beforced down against the upper end of the sleeve 4 so as to hold thecutters 8 out firmly against the Work.

By the use of the implement herein described the lower end of a bore maybe gradually enlarged and at the same time the walls and bottom of thebore kept smooth so as to provide a perfect form for a footing ofconcrete, as 17.

lVhat I claim 1. A device of the character described including a drivingshaft, a barrel fixed thereto and having inlet openings, cutters pivotedat one end to the bottom of the barrel and whose other ends are adaptedto work vertically through said openings and project beyond the barrel,a sleeve keyed to the shaft and slidable thereon, links pivoted to thesleeve at one end and Whose other ends are pivoted to said respectivecutters.

2. A device of the character described including a driving shaft, abarrel fixed there to and having inlet openings, cutters pivoted at oneend within the barrel and Whose other ends are adapted to Workvertically through said openings and project beyond the barrel, a sleevekeyed to the shaft and slidable thereon, links pivoted to the sleeve atone end and Whose other ends are pivoted to said respective cutters andguides on the outer ends of the cutters adapted to guide the out tingsthrough said openings and into the barrel.

8. A device of the character described including a driving shaft, abarrel fixed thereto and having inlet openings, cutters pivoted at oneend to the bottom of the barrel and whose other ends are adapted to workvertically through said openings and project beyond the barrel, a sleevenon-rotatable relative to the shaft and slidable thereon, links pivotedto the sleeve at one end and whose other ends are pivoted to saidrespective cutters, and a nut threaded onto the upper end of the shaftand adapted to abut the corresponding end of said sleeve.

i. A device of the character described including a driving sha'lt; abarrel fixed thereto and having inlet openings, cutters pivoted at oneend Within the barrel and whose other ends are adapted to work invertical planes through said openings and project beyond the barrel, asleeve keyed to the shaft and slidable thereon, links pivoted to thesleeve at one end and Whose other ends are pivoted to said respectivecutters, radial blades can ried by the bottom of the barrel,.said bottomhaving inlets for the blade cuttings in front of the respective blades.

In testimony whereof I have signed my name to this specification.

JOSEPH OLSON.

